asterisk users - Feb 2012 - Automatic Number Identification and anonymous calls

Hi,

This morning I called an analog line from a cell phone.

For the first call, I made a standard call and could both read my CID
and ANI in my Asterisk console.
For the second call, I choosed to hide my ID and, to my surprise, I
read that my CID and ANI were both empty.

I always thought that ANI (Automatic Number Identification) could not
directly be set or changed by end users.
In this experiment, it seems that if an end user calls anonymously,
the ANI is also hidden to the receiving party.

Is this standard practice ?
Does it depends on the telco networks the call is passing through ?
Thoughts ?

Regards

On Wed, Feb 8, 2012 at 2:35 AM, Olivier <oza_4h07 at yahoo.fr> wrote:
> I always thought that ANI (Automatic Number Identification) could not
> directly be set or changed by end users.
> In this experiment, it seems that if an end user calls anonymously,
> the ANI is also hidden to the receiving party.
>
I never work with analog lines, but I do believe that anything less than a
PRI would have the blocking done at the telco end before you get it.


-- 
Carlos Alvarez
TelEvolve
602-889-3003
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On 02/08/2012 10:06 AM, Carlos Alvarez wrote:
>
> On Wed, Feb 8, 2012 at 2:35 AM, Olivier <oza_4h07 at yahoo.fr
> <mailto:oza_4h07 at yahoo.fr>> wrote:
>
>     I always thought that ANI (Automatic Number Identification) could not
>     directly be set or changed by end users.
>     In this experiment, it seems that if an end user calls anonymously,
>     the ANI is also hidden to the receiving party.
>
>
> I never work with analog lines, but I do believe that anything less than
> a PRI would have the blocking done at the telco end before you get it.
Mostly correct; ANI is only delivered over ISDN, SS7 and *some* E&M 
trunk circuits. Analog circuits have no ability to transport ANI.

-- 
Kevin P. Fleming
Digium, Inc. | Director of Software Technologies
Jabber: kfleming at digium.com | SIP: kpfleming at digium.com | Skype: kpfleming
445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
Check us out at www.digium.com & www.asterisk.org